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This is sometimes caused by dirt in the gas tank. When the saw is off and being moved around the dirt settles to the bottom. The saw will start OK and rev up but after a while the dirt gets shaken up and sticks to the fuel filter in the tank. When enough dirt covers the filter the saw looses power or dies all together. Sometimes it will get enough gas to idle but not enough to run at high speed. With the tank half full, shake the saw to get all the dirt stired up and dump it out. Put a little gas in it and shake & dump it again. If you can fish the fuel line with the filter on it out, remove the filter and either replace it or blow it out. If this doesn't cure all your problems you may have leaks in the fuel line to the carb that are letting in more air than gas causing your power problems.
Replace the bar. Your bar has gone bad and that is why you are losing power. Bars are made by the chain saws to be completely oiled at all times. When the bar does not get oil the bar will start to warp and that is what will cause you lack of power when trying to due a top cut
Cordless tools lose power as the battery drains, while corded tools deliver reliable, consistent performance with unlimited run time. Corded reciprocating saws range from less than 5 amps to 15 amps or more, with more than 10 amps providing optimal power for heavy-duty commercial use.